Table of Contents
1 Introduction .................................................................................................................................... 6
1.1 Intended Audience .................................................................................................................. 6
2 Advantages of High Availability (HA) .............................................................................................. 7
3 Prerequisites ................................................................................................................................... 8
4 HA Components .............................................................................................................................. 9
5 Setting Up HA ................................................................................................................................ 10
5.1 Set up the First Unit .............................................................................................................. 10
5.2 Set Up the Second Unit ......................................................................................................... 12
5.3 Enable the “Use for HA Checks” Option ............................................................................... 15
5.4 Test Failover .......................................................................................................................... 15
6 How to Perform a Firmware Update on HA Pairs ......................................................................... 17
7 HA Disaster Recovery Process (Replacing a Defective Unit) ......................................................... 18
7.1 Prerequisites ......................................................................................................................... 18
7.2 Installation ............................................................................................................................ 18
7.2.1 Reboot the Active Unit .................................................................................................. 19
7.2.2 Change the Switch to Preferred Server Option ............................................................ 20
8 HA WUI Options ............................................................................................................................ 21
8.1.1 Interfaces ...................................................................................................................... 21
8.1.2 HA Parameters .............................................................................................................. 22
9 Troubleshooting ............................................................................................................................ 26
9.1 General Troubleshooting Tips ............................................................................................... 26
9.2 No HA Status Squares are Visible in the WUI ....................................................................... 26
9.3 Green/Red HA Status Squares .............................................................................................. 26
9.4 Blue HA Status Square .......................................................................................................... 27
9.5 Both Units are Active and the WUI is Unresponsive – Blue or Red Status Square ............... 27
9.6 Grey HA Status Square .......................................................................................................... 27
9.7 Virtual Services Temporarily Unavailable After Failover ...................................................... 27
9.8 No Access to WUI on HA1/2 or Shared ................................................................................. 28
9.9 Nothing Works ...................................................................................................................... 28
9.10 Issue with Hyper-V and HA on a Pair of VLMs ...................................................................... 28
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